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Hillary Clinton, Donald Trump Contest Expands to New Battlegrounds

Traditionally less competitive states feature close races between Democratic, Republican candidates

A new WSJ/NBC/Marist poll shows Hillary Clinton and Donald Trump are close in states that usually favor one party over the other, including Arizona and Georgia for the GOP and Nevada and New Hampshire for the Democrats. WSJ's Aaron Zitner assesses the electoral map. Photo: Getty

In a sign that the list of competitive states in the presidential race is expanding, Hillary Clinton and Donald Trump are locked in tight contests in four states, including two that haven't been battlegrounds for decades, new Wall Street Journal/NBC News/Marist polls find.

The polls could be a warning sign for Mrs. Clinton, the Democratic nominee, as they found the races in New Hampshire and Nevada—two states that Democrats have won...